Not every DB schema can be converted. MySQL is more complex and feature-rich than SQLite. However, if your schema is simple enough, you could dump it into an SQL file and try to import it / load it into an SQLite DB.

have you tried to simply export your mysql-database and import it to sqlite? i don't know sqlite, but maybe this works that easy / maybe you have to do some little adaptations, but both is sql and should be almost compatible.